Schaum's Easy Outline Molecular and Cell Biology

William Stansfield, Raul Cano, jaime Colome

Chapter 1 Cells - all with Video Answers

Educators

Chapter Questions

Problem 1

Aside from DNA and certain associated proteins in chromosomes, what macromolecular aggregates are shared by all prokaryotes and eukaryotes?

Both prokaryotic and eukaryotic cells possess a lipid plasma membrane that separates a cell from its environment. In addition, all cells have ribosomes, made partly of protein and partly of ribonucleic acid (RNA) molecules. Ribosomes function in the synthesis of proteins.

Bryan Lynn

Numerade Educator

00:20

Problem 2

How are chloroplasts and mitochondria structurally similar?

They both are surrounded by an inner and outer membrane, a means for increasing the area of their membrane systems, contain their own circular chromosome, and have their own ribosomes.

Sam Limsuwannarot

Numerade Educator

01:21

Problem 3

Why can't $\mathrm{H}_2 \mathrm{~S}$ or $\mathrm{NH}_3$ act as terminal electron acceptors in anaerobic respiration?
$\mathrm{H}_2 \mathrm{~S}$ and $\mathrm{NH}_3$ are both already completely reduced.

George Bennett

Numerade Educator

01:20

Problem 4

What would you expect to happen if a facultative anaerobe were grown in the presence of oxygen and glucose?

If oxygen is present for aerobic respiration, fermentation essentially ceases, the rate of glucose consumption decreases, and the rate of acid and/or alcohol production is inhibited. This phenomenon is known as the Pasteur effect.

Carlene Jimenez

Numerade Educator

02:39

Problem 5

What occurs in meiosis, but not mitosis?

Synapsis, crossing over, and separation of homologous chromosomes happen during meiosis, but not mitosis.

Carlene Jimenez

Numerade Educator